Make request parsing reentrant

include/client.h

@@ -17,7 +17,6 @@ typedef struct RdbClient {
 } RdbClient;
 
 void rdb_client_init(RdbClient *self, int connfd);
-ssize_t rdb_client_read(RdbClient *self, char *buf, size_t len);
 void rdb_client_begin_packet(RdbClient *self);
 bool rdb_client_write_str(RdbClient *self, const char *str);
 bool rdb_client_write_str_hex(RdbClient *self, const char *str);

include/hex.h

@@ -0,0 +1,8 @@
+#ifndef V810_HEX_H_
+#define V810_HEX_H_
+
+#include <stdbool.h>
+
+bool parse_hex_digit(char digit, char *out);
+
+#endif

include/request.h

@@ -0,0 +1,41 @@
+#ifndef RDBSERVER_REQUEST_H
+#define RDBSERVER_REQUEST_H
+
+#include <stddef.h>
+
+#define INBUF_LEN 256
+
+typedef enum rdb_read_result_t {
+    read_result_success,
+    read_result_error,
+    read_result_pending,
+    read_result_disconnected,
+} rdb_read_result_t;
+
+typedef enum rdb_read_state_t {
+    read_state_header,
+    read_state_body,
+    read_state_body_escape,
+    read_state_checksum_1,
+    read_state_checksum_2,
+} rdb_read_state_t;
+
+typedef struct RdbRequest {
+    int connfd;
+    struct Buffer {
+        char buf[INBUF_LEN];
+        size_t len;
+        size_t index;
+    } inbuf;
+    rdb_read_state_t state;
+    char *cmd;
+    size_t cmdlen;
+    size_t outlen;
+    char chk;
+} RdbRequest;
+
+void rdb_request_init(RdbRequest *req, int connfd, char *cmd, size_t cmdlen);
+void rdb_request_reset(RdbRequest *req);
+rdb_read_result_t rdb_request_read(RdbRequest *req, size_t *len);
+
+#endif